With its eco-friendly design and commitment to sustainability, the Hydro Flask Standard 21oz Bottle is not just a hydration essential but a statement of your dedication to both style and the environment. Constructed from premium-grade stainless steel, it boasts unparalleled insulation technology, ensuring your beverages stay refreshingly cold for up to 24 hours or piping hot for up to 12 hours.  The powder-coated finish not only adds a touch of sophistication but also provides a non-slip grip, making it a reliable companion for every excursion. Its standard mouth opening allows for easy sipping and compatibility with most backcountry water filters.